Solvents for acetyl cellulose.



"No Drawing.

substances or menstrua.

UNITED (STATESPATENT OFFICE.

WILLIAM G. LINDSAY, on NEW YORK, N. .,Ass1e1von TO THE CELLULOID com rm,-

OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

- sonvnn'rs non. AGETYL CELLULOSE.

Specification of Letters Patent.

Application filed August 10, 1911. Serial No. 643,375.

Patented May 28 1912.

To all whom it may concern Be it known that I, WILLIAM G. LINDSAY, a citizen of the United States residing in the city of New York, countyof New York, State of New York, have invented certain new and useful Improvements in Solvents for Acetyl Cellulose, of which the following is a specification.

The various compositions to which the present invention relates are employed in the arts mainly as imitations of natural substances and consist of soluble cellulose combined with or dissolved in certain other Although the final or useful form of the different compounds of this class is .that of a solid or dried material, difieren't processes of co-nversioninto this final solid form involve, 'asis Well understood, the employment of solutions or mixtures of varying consistency as to plasticity, stiffness or fluidity, dependent generalIyupon the propor-.

I tion and kind of solvent used to the amount of cellulose.

There are two classes of solvents ;liquid solvents, of which wood spirit is a good example fornitro cellulose, and solid solvents, of which camphor is a good repretures are also formed by combining two or more substances with each other; the components of the mixed solvent in such a case may not necessarily be possessed of 1nd1- vidual solvent power. For instance, alcohol, which is tpractically a non-solvent in itself, forms a good solvent mixture for nitro cellulose when camphor is dissolved in it; ethyl alcohol and etherform a solvent of nitro cellulose, while neither is a solvent by itself. Methyl alcohol will dissolve nitro cellulose, but isnot a solvent by itself" of acet 'l cellulose. The various-applications of t is art require the employment of com- .plexmixtures in the solvent,-single substances vbeing rarely used for such purposes. Hence, while the advancement of the art has, as is well known, depended largely on the discovery and application of new single solvent substances, yet it has required also the invent-ion of combinations of solvents by which effects are produced quite different from those, produced when single solvents are employed alone.

I have discovered that the solvent power Solvent mixof acetodichlorhydrin for acetyl cellulose is greatly increased by the use of an alcohol such as ethyl or methyl alcohol and that objects such as films, sheets, &c., produced by.

, solids as camphor, &c., and with coloring matters and with inert-material which give body to the composition, as is well known to those skilled in the art.

As an example of carrying out my invention I proceed as follows: I dissolve one part of acetyl cellulose (by weight) in a mixture consisting of three parts of acetodichlorhydrin (by volume) and two parts methyl alcohol (by volume). I Such a'mixture is suitable for the manufacture of films or sheets by evaporation, apdif a massive product is desired the'evaporation may be promoted by kneading the mass on rolls, as

is well understood in the art. Again, a mixture of acetodichlorhydrin and ethyl alcohol in equal parts is efficient. But I do not limit myself to the specific proportionsv given in the above examples.

What I claim and desire to secure by Let-- ters Patent is: I

1. A composition of matter consisting of acetyl cellulose dissolved in a mixture of acetodichlorhydrin and alcohol, substandescribed.

WILLIAM G. LINDSAY.

Witnesses:

J. E. HINDON HY E, MABEL DENTON.

ture with 'other solvents and coloring mat- 'ters and inert substances, substantially as 

